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Known Good MCP server

Which servers in the official MCP registry are Known Good's own, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-20

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Whose server it is
  • Registry namesh.knowngood/knowngoodverified in the MCP registry

The registry name sits under knowngood.sh. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-20
  • Stateanswerschecked 2026-10-20
  • Tools3
  • Server calls itselfknowngood
  • Server version1.9.0
  • Protocol version2025-06-18

On 2026-10-20 the server answered initialize and tools/list without a sign-in. First answer in 25 ms.

Should an agent connect itNot proven either way yet
  • Its tools do every use case we checked: search for websites that AI agents can use; check a page for WebMCP support; read a site's agent-readiness test report.
  • Checked on 2 of the 7 days it takes to judge reliability.

Once connected

  • For "search for websites that AI agents can use", the likely first call is find_capability.
  • For "check a page for WebMCP support", the likely first call is check_webmcp.
  • For "read a site's agent-readiness test report", the likely first call is get_site_report.
  • Parameters are untyped or undescribed in 1 of 3 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 2, the first on 2026-10-20
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 2 so far
  • What an agent can do with it3 of 3 use cases
  • Answeredmeasuring2 of the 7 daily checks it takes to print a share
  • Median first answer267 ms
  • Space in an agent's context≈ 864 tokensthe definitions of all its tools (3), which an agent carries on every turn
  • Tool definitionsA · 94 of 100
  • Typed results0 of 3 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 1 of 3

What an agent can do with it

  • can do · search for websites that AI agents can use
  • can do · check a page for WebMCP support
  • can do · read a site's agent-readiness test report

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (30%), doing the product's job (25%), definitions (20%), context (10%) and use (15%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers3 tools · read 2026-10-20
  • check_webmcp

    Check a website LIVE for WebMCP tools, and where a browser is available whether any tool actually registers when the page runs. Returns one of: registered, declared_only, declared, not_declared, could_not_ask, or excluded when the site's…

  • find_capability

    Find websites where an agent can accomplish a task. Returns probe-verified agent-readiness signals, unverified apparent actions read from page content, the verification tier, how each site was found (it declared agent access, probe…

  • get_site_report

    Fetch Known Good's dated verification report for one listed website: which capabilities were tested, which passed, when it was probed, what an agent can apparently do there, and how the site was found: whether it declared agent access…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "knowngood": {
      "type": "http",
      "url": "https://knowngood.sh/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http knowngood https://knowngood.sh/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://knowngood.sh/mcp as a custom connector in the settings.

OpenAPI spec

4 paths, read 2026-10-20. Open the spec ↗

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.